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| author | Sasha Levin | 2012-05-30 00:06:15 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2012-05-30 01:22:18 +0200 |
| commit | 08fa29d916c6e271ad13978cd993e7238c68db97 (patch) | |
| tree | a7f7aa9a3a468cba985e5a26551b504f48e2922e /mm/memory-failure.c | |
| parent | cris: select GENERIC_ATOMIC64 (diff) | |
| download | kernel-qcow2-linux-08fa29d916c6e271ad13978cd993e7238c68db97.tar.gz kernel-qcow2-linux-08fa29d916c6e271ad13978cd993e7238c68db97.tar.xz kernel-qcow2-linux-08fa29d916c6e271ad13978cd993e7238c68db97.zip | |
mm: fix NULL ptr deref when walking hugepages
A missing validation of the value returned by find_vma() could cause a
NULL ptr dereference when walking the pagetable.
This is triggerable from usermode by a simple user by trying to read a
page info out of /proc/pid/pagemap which doesn't exist.
Introduced by commit 025c5b2451e4 ("thp: optimize away unnecessary page
table locking").
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: <stable@vger.kernel.org> [3.4.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory-failure.c')
0 files changed, 0 insertions, 0 deletions